Pressing head for pressing machines and method of its manufacture



Jan. 29, 1946.

F. C. LORNITZO PRESSING HEADS FOR PRESSING MACHINES AND METHOD OF THEIRMANUFACTURE loo Hf" K E Filed Aug. 1, 1941 5 Sheets-Sheet 3 INVENTORFRANK c. LORNITZO ATTORNE F. C. LORNITZO 7 ADS FOR PRESS Jan. 29, 1946.

PRESSING HE ING MACHINES AND METHOD OF THEIR MANUFACTURE 5 Sheets-Sheet4 Filed Aug. 1. 194l AV A17 A w m w. M w

' INVENTOR FRANK c. LORNITZO a ATTORN Y Jan. 29, 1946. F. c. LORNITZO2,393,597

I PRESSING HEADS FOR PRESSING MACHIN-ES'AND METHOD OF THEIR MANUFACTUREFiled Aug. 1, 1941 5 Sheets-Sheet 5 .v I INIVIENTORN" I FRANK C.LQRNITZO Patented Jan. 29, 1946 Y UNiTEl) STATE PRESSING HEAD FOR'PRESSING MACHINES ANIIMETHOD OF ITS MANUFACTURE 'Frank C. Lornitzo,Pawtucket. R. 1., assignor to Pantex Machine, Inc., Central Falls,

R. L, a corporation of Rhode Island ilpplicatlonAngust 1, 1e41, SerialNo. 405,008

' .11 Claims.

My invention relates to improvements in pressipg heads for garmentpressing machines, and

(cits-cs) vtear on the prior art screws,- Joints and gaskets.

improvements in their methodtgf manufacture.

An object of my invention is provide a light strong pressing head inwhich the body portion and pressing plate are welded together to form asubstantially integral unit.

4 While I am aware that one piece pressing heads have heretofore beenmade, they have been extremely diflicult to manufacture and due to aninherent difliculty in the manufacture thereof, it

It is obvious that with the welded structure the continuous Jointbetween the plate and the body is so strong that these relativedifferences, in ratios of expansion in use will positively not have anysuch deleterious eflects on the pressing head. I have also found inpractice that I am has beenimpossible to add desirable character isticsto such cast one-piece pressing heads.

While the desirability of providing a substantiallyone-piece pressinghead has been reco nized in the prior art and the desirability ofinitially manufacturing such aiplfessing head in two pieces, namely, abody portion and a pressingplate so that the desirablHefln'ements instructure may'be' present in the I complete pressing head has also beenknown,

so far asI am aware no one in the prior art has been able to weld arelatively thin pressing plate to a body portion of muchlarger volumeand a main feature of my invention relates to the seleetionof portionand pressing the materials of the body plate to make such'weldingpossible.

v I thus preferably cast the metal body portion, preferably from a lightmetal such as aluminum or alloys thereof, magnesium, etc., and in orderthat the relatively thin pressing plate maybe welded thereto, Ipreferably construct the pressing plate of a weldable metal or alloy ofhigher M. P. than the weldable metal or alloy of the body'portion sothat as the welding'heat is apable to'provide a, succession of pressingheads in the'prior'art structures. a

An additional advantage of my invention over the prior art one-pieceintegral struetur is, that it ismuch easier to initially apply th dewithless variation is .weight than is possible sired structure and finishtoasingle metal presspressingsurface integral with i f plate thanto a va body portion, and .I am thus enabled to provide a pressing platehaving more uniformity in hard ness, density. grain and-thickness than,the prior art structures and also a continuous, unbroken pressingsurface, rivets, etc.' y a As stated, my invention is particularlyadapted for use with aluminum alloys, thus providing a not defaced byscrew holes,

relatively lighter pressing head thanihither'to .thoughtpossible.

'A. further object (if my invent on is to paivide a pressing plate ofmore uniform'thickness without making allowances for variations in theplied to the contacting edges of the pressing plate and body portion,the contacting edges only of the pressing plate will melt onlysufiiciently to provide material for the weld. It is obvious that if thebody portion and pressing plate were constructed of metals havingapproximately the.

same M. P, (melting point) due to the fact that the pressing plate is ofmuch smaller volume, the

Plate .to cause its pressing surface to be partially melted, therebymaking such welding impossible.

It has beencustomary in the priorart to provide a pressing plate andsecure it to the body portion by means of screws, often interposing agasket or other sealing material. such as hard- -weldin'g heat will beconducted to the pressing molding or machining steps formerly necessary.A further feature of my invention is to'provide a pressing plate whichma be provided'with a greater, multiplicity of smaller perforations thanhitherto thought possible. when an iii-- tegral pressing head has beencast in the prior art,,it has often only'been' possibletopro'vide; asteam spray chamber of small volume and it has been necessary todrillholes to such'a chamher, where due to this inherent featureofconstruction of the presser head, only asmall number of holes to thisthus restricted area have been possible. For this reason, it has beennecessaryto make the relatively small number of" holes quite large indiameter so as to pass .suflieient steam to the garments being, pressed.with a large number of holes of smaller diameter it is apparent that notonly greater desirable distribution is effected, but that less steampressure.

. is required 'to get the desired results and the .eombined area of thesmaller holes is greater than the combined area of the larger holes for-.merly' only possible to employ.

enlng paste between the plate and body portion. This structure often haprovided breakable gaskets and leaky joints, which are positivelyeliminated by my improved structure. It is obvious that in use the heatis first applied to the heating chamber in the body portion, therebyihitiallyheating the body portion, tending to cause the body portion toexpand in a greater ratio than the 918N171! consequent wear? and Afurther feature of my improved pressing head is to improve the heatconductivity thereof. In

my improved device the lower surface of the body portion is providedwith an inset spray'ehamber forming portion, which for heat conductingpurposes is preferably provided with a plurality-of bosses projectingdownwardly therefrom. Inasmuch as prior to welding, I- preferably'bow ortransversely arch the pressing plate with asmalirer radius than that ofthe transversely arched lower surface of the body portion, it isapparentthat contact between the upp r surface of the pressing plate andthe lower ends of the bosses is insured to increase the heatconductivityof the pressing plate, the heat being transmitted from the steam chambernormallyjocated in the body above the steam spray chamber through I theintervening walland bosses to said pressin plate. In theprior art it hasbeen impossible to cast an integral structure having these desirablebosses. I

described, Due to the improved With my improved structure,--it isalsoapparent that it is easy to lay out a multiplicity of,

' small perforations in the pressing plate to positively insure thatthey will discharge wlthinthe 1 open portions of the spray chamberintermediate said bosses. With the large drilled holes inthe prior artit has been foundthat the stream spray has often left marks on thegarments being pressed which marks are eliminated with th dishead havinga rou lower surface, I have. discovered proved pressing head may be usedfor allsuch purposes with enough heat being supplied to the I light orfine goods.

rough pressing surface thereof to readily iron In othenwords, I haveprovided a single pressing head suitable for supply: ing sufflcient heatfor all uses, thereby eliminating'the necessity f 1- two types ofpressing heads tribution-of steam through the multiplicity of smallerperforations possible with my improved pressing head.

Agreat-difilculty in the cast pressing heads of the prior art has beento provide a steam spray chamber of sufiicient area due to thedifficulty of removing the-molding sand therefrom, which dif-' flcu-ltyhas been enhanced if any attempt has been made to cast bosses to projectwithin said steam spray chamber. A further object of my invention is toprovide a structure wherein the necessity of removing molding sand outof a cast interior chamber is eliminated;

A furtherobject of my invention is to faciiitate the hole drillingoperation, as it is obvious; that a greater multiplicity of holes can bemore easilydrilled in a relatively small thin plate than through athicker surface pf a casting, this being particularly true if it has alowerpressing surface transversely arched.

- The desirability of providing a lower pressing ments being'pressed asa smooth surface will tend to do has long been recognized. It, has beensuggested that the lower pressing surface of an integral pressing headbe suit-ably roughened,

which operation has been very hard to do in a heavy pasting. ltgmasalsojbeen suggested to attach a supplemental rough surface to the lowersurface of the pressing head and for this presssurface which will notflatten the nap of the ga'rg plate thereof broken away ing, surface,detachable wire grids orcloths have a froth often been employed toprevent-"' de shiny.

being laid down and the garmen Whilescreen grids have-also been used forthis purpose, it is apparent that interposing a separate surface forthispurpose has decreased the heating eficiency o f-the pressing machinedue" to the necessity of interposing a supplemental mem- I I berusiially at a slightly spaced distance between the, garment beingpressed and the pressing surthought necessary the prior art r Employingmy invention, it is also possible to change from a pressing head havinga smooth -pressing surface to one having arough pressing surface bymerely sandblasting the pressing sur-- face thereof in the mannerdescribed in theclaims ,herein. Further objects of niy invention are toprovide improvements in the composite method preferably employed by mein'making my improved pressing head and improvements in the variouscomponent steps thereof and the articles produced thereby.-

These and such other objects ofmy invene tion as may hereinafter appearwill be best understood from a. descriptionof the accompanying. drawingswhich illustrate various embodiments thereof.

In thedrawings,

Fig. 1 is a perspective view of a portion ofa pressing. head constructedin accordance with myinve'ntio'n having a portion of the pressing andillustratingfor purposes-of clarity of the remainder of-the drawings oneportion only thereof roughened.

.Fig. 2 is avertical sectional view taken centrally thereof through thesteam fspray valve in a closed position preventin chamber to the steamspray chamber.

Fig. 3 is a vertical sectional view similar to Fig, 1 with the steamspray valve in a position to admit steam tothe steam spray chamber.

fig. 4 is a perspective view illustrating the step of cutting a pressingplate from a relatively thin sheet of metal of higher M. P. than thecast metal pressing head body portion, .preferably of slightly greaterarea than the lower surface of 1 face, which supplemental 'surface hasoften in;

the case of cloth, been not readily heat conductive.

A further object of my invention is to provide I a structure wherein thelower surface of the pressing plate may be. readily. roughened in one ofseveral manners and in which theinterposition of a separate roughsurface between the pressing surface and the garment to be pressediseliniinated. I have discovered that the manipulation of'the pressingplate to effect the roughening ofthe pressing surfacethereof may bereadily ac-' complishedin several'manners if it"is so roughened prior tobeing attached. Thus prior .to being welded to the body portion,thelower surface of said-body portion.v 1

Fig. Ei'is a perspective view illustrating the. step of drilling, amultiplicity of holes in the so cut pressing plate. v n

Fig-G-is'a detailed sectionaiiview illustrating a plurality ofsuchholesin sa dpressing plate. Fig. 7 is an end elevation illustrating thestep "of transversely arching the pressing plate with a smaller radiusthan that of the lower surface of s the body portion by a plurality ofpressing .rolls.

Fig.8 is a disassembled perspective view showingthe preformed andpreperforated pressin plate in the act 'ofbeing brought into weldinjuxtaposition with the lower surface of the bodyportion.

Fig. 9 is a sectional view? through asuitable I edges of the lowersurface of said body while the contacting edges of said body portion andplate are being welded by melting the pro- Jecting edgesof said plate toweld the edges of said plate to the. edges of the lower surface of thebody portion, showing certain edges of said plate and body member weldedby a suitable welding device and other edges thereof prior to beingwelded. l

showing how the projecting edge of the plate .(shown in dotted lines) ismelted to form the weld, as shown in full lines.

Figs. 11-14 illustrate a method for roughening the lower surface of thepressing plate, Fig. 11 being a plan view of the perforated pressingplate, Fig. 12 being a sectional view showing three layers comprising anupper and lower layer, one of which comprises the preformed pressingplate shown in Fig. 11 .and the other of which comprises another suchplate ofsimilar shape having a layer of wire screening interposedbetween them about to be inserted between compressing rolls, Fig. 13being a sectional'view similar to Fig. 12 showing how said layers are Qcompressed after passing between said rolls to form screeningimpressions on the adjacent surfaces of said upper and lower layers andFig. 14 3 being a detailed sectional view illustrating such a roughenedsurface on a pressing plate roughened with screening impressions on thelower pressing surface thereof.

Figs. 15-19 illustrate an alternative method '-I may employjforroughening the lower surface of the pressing plate by-corrugating itwith a suitable corrugating tool. Fig. 15 being: a plan view of aperforated pressing plate, Fig. 16' being a front elevation of asuitable corrugating tool,

Fig. 17 beinga side elevation illustrating said tool in the act ofcorrugating the pressing plate while held on a suitable form, in thisinstance prior to arching said plate, Fig. 1-8 being a planviewillustrating the corrugating tool in the act of corrugating said surfaceand Fig; 19 being a detailed sectional view through such a perforatedcorrugated pressing plate.

Fig. 20 is a detailed sectiorial view takenthrough an assembled pressinghead illustrating an alternative method of roughening the lower surfaceof the pressing plate, in-this instance after'it [has been assembled bysandblasting it with. asuitable device and at the same time dischargingfluid outwardly through theperi'orations in said plate from the interiorof the hollow pressing head with such force as topermit a partialconstriction but The lower roughened surface of the pressing plate 38may comprise. (a) a sandblasted surface as shown at 44 in Fig.1 toprovide a closely pitted surface, (22) a surface roughened by havingwire 5 screening impressions therein as-shown at 44' in Fig. 14 or (c) asiu'face roughened by having corrugations 44"- therein as shown. in Fig.18. While I preferably employ a pressing head having a ,roughened lowerpressing surface ,66, it is v l0 obvious that for certain types of worlrsaid lower] Fig. 10 is an enlarged detailed sectional view surface maybe left smooth if desired.

While certain features of my invention may be incorporated into any typeof pressing head, as shownin Figs. 1--3 the metal body portion 62 '15preferably has a. lower ,wall comprising a thin prevent a totalobstruction ofthe lower ends of the perforations.

Fig. 21 .is a detailed sectional viewof such a A/ perforated sandblastedpressing-plate showing a partially constricted perforation therein. Inthe drawings, wherein like characters of reference indicate like partsthroughout, 32 gen-' marginal portion 46 extending continuously aroundthe edges thereof and an inset steam spray chamber' forming portion 48interior of said marginal portion 46, said inset portion having amultigo piicity of bosses 50 projecting at spaced distances downwardlythroughout the area thereof. Said" body portion 32 is also provided withan upper steam heating chamber 52 above said steam spray I chamberforming portion 46. The relatively thin g ggpressing plate 36 of a metalof higher M. P. is

as steam spray chamber 64, the upper the inset portion 46 forming thetop wall thereof a 40 tachment '64 projecting upwardly from thecenterprovided with a multiplicity of preformed perforations 42 therein spacedat predetermined intervals throughout the area thereof and has the edgesthereof welded to the edges of said marginal ,30 portion 46 so that'saidbosses 50 contact said plate 36 to conduct heat thereto, said devicebeingdesigned so t "at the perforations 42. are located intermediatesaid bosses. It is thus obviousthat the pressing plate 36 forms thelower wall of the and the inner-ends of the marginal portions 46 formingthe side and end "walls thereof.- The.

pressing head 30 is provided with the usual atthereof for dischargingsteam from the steam heating chamber 52 outwardly through theperforations 42 through the steam spray chamber 64. Said attachment hasthe adjustable valve 10 in the upper. end thereof and has the passage 661 leading from the steam heating chamber 62 to said upper end and apassage 62 leading downwardl-y from said upper end to the spraydischarge. chamber 64, said passages being separated from each other atthe upper end thereof by thewall 66 having the orifice 66 thereinforming a valve seat. The valve. 10 has the valve stem I2 projectingoutwardly from aside of the upper end of said attachment '64 andcomprises a valve formsurface of ing enlargement i0 normally urged bythe spring 14 to a.position closing said orifice". A handle 16 ispivotally mounted on theframe having an arm 11 adaptedon depression ofthe handle I6 to push the valve stem 12 inwardly against the 60 force ofthe spring." to move the valve enlargeerally indicates a hollow pressinghead for garment pressing machines constructed in accordance with myinvention.

Said pressing has comprises a hollow body portion 32' having. the

5 chamber 54,

of a higher M. P. having alower surface 86 preferably transverselyarched as .at

erably having a multiplicity of preformed perforations 42 therein, andpreferably roughened as at 44, having the edges thereof welded to thement ill free of. the orifice 68 to permit steam. from the steam-heatingclia nber 62 to pass up- L wardlythrough the duct 60, orifice 68 anddownwardly through theduot 62 to the steam spray in'said spray chamber54 underneath said passage 62 to be distributed evenly. throughout thearea a of saidsteam spray chamber 64 and to be discharged downwardlythrough. said perforations depression of the handle 16..

70 -42 onto the garments being pressed as desired on 40 andpref-- beingdispersed by a bailie I6 mounted It is apparent that this constructionovercomes many obstacles in the manufacture-and functiming of prior artpressing heads. By employportion. 76 ing a multiplicity of bosses 60 andinsuring, that the upper surface of the pressing plate 36 is in vcontact therewith, a high. degree of conductivity from the steam chamber52 is provided, so great in fact, that sufllcient heat may be conductedto the pressing plate for all purposes, making it possible to employ aroughened surface 44 as the .pressingsurface of said pressing plate,whether thepressing plate is to be used for pressing heavygarments-fancy goods, silks, or other flne laundry work. A structure isalso provided;

wherein it is easy to so design the perforations arched lower surface ofknown radius. The

42 and-to distribute them over such a large area I of the pressingsurface that a relatively smaller steam pressure may be employed thanformerly.

" Employing this construction, as there is no difll- 5 culty in removingmolding sand from interior,

chambers of integral castings, the steamspray chamber may be made ofmuch la ger area than" formerly and the pressing plate provided with alarger number of'perforations discharging intermediate said bosses. Myinvention also makes possible the use of a-continuously welded jointsecuring the edges of the pressing plate to theedg es of the lowersurface of the body .portion, thereby eliminating leakage formerlypresent i when bolts were used for joiningthe edges of pressing platesto body portions, the blowing out of gaskets and providing asufficiently tight joint which will not yield on diflerences in heatexpansion between said bodyportion and plate. In addition, I haveprovided astructure wherein the lower pressing surface 30 may be readilyroughened in any suitable manner.

While the desirability of' weldiifga relatively thin-pressingplate to abody portion of a pressing head has long been desired, no way has beenknown hitherto of melt away a large portion of the pressing plate. Inthe specification and claims I employthe abbreviation M. P. to signifymeltin point." -I

have discovered that such a welding becomes possible if the metal ofwhich the pressing plate is constructed be generally similar to that of,but

having a; higher M; 1?. than the metal of the body 1 between saidportions may be compensated for by this difference in M. P. to cause theedgesonly of {the pressing plate-to melt to weld the edges of thepressing plate to the edges of the lower sursirable welding featurecommercially. possible.

While anysuitablemetals may be employed for the body portion and for thepressing plate, it

is desirable that the'pressing plate be as light as possible and Itherefore preferably construct the body portion of aluminum alloy-and'the pressing .plate itself of aluminum or an aluminum alloy Yhaving a higher M. P. As; stated, in place of aluminum or suitablealuminum alloy, magnesium or suitable-magnesium alloy may be-employedboth in the body portion and pressing plate.

My invention therefore also includes improvements in the-method ofmaking such a pressing head. If'or' this purpose the hollow metalpressing head body portion 32 may be suitably cast,

ing' preferably provided with a transversely portion so that thedifferences in volume of metal face of the body po'rtion.- It isapparent that my iudiciou selection of materials makes this deorotherwise formed in any suitable manner be-' .pressing'plat'e may-alsobe suitably formed in anydesired manner, such as shown inFig. 4 bycutting it out by means of the shears or in any other suitable.manner-from the relatively thin sheet 82 of metal of higher M. P. thanthat of the body 02. The pressing plate is preferably formed, ofslightly greater area than the lower surface 34 ofsaid body portion,-although it is 10 still possible to weld it to the lower surface 34 ofsaid body portion if the'pressing plate 36 be substantially ofthe' samearea. A large multiplicity of :aligned holes 42 may then be formed insaid plate in anys table mannensuch as by the 86. The press g plate 36may then be trans- .verselyv arched in any suitable manner, such as isshown in Fig. '7, by passing itbetween a' plurality of suitably spacedrolls,.inf the embod ent shown, comprising the lower roll 88, the. upperroll adjustable relative thereto for thickness of the pressing plate 36and the bending roll 92 also vertically adjustable to ,vary'thecurvature imparted to the plate 30.. If the pressing plate 36 bearched along a smaller radius than that of the -50 toprovide continuousheat conductivity conduit means to said plate."

I. then bring said. plate 36 into welding juxtaposition to the lowersurface 04 of said body portion 32. Fig; 8 illustrates-the pressingplate in the act of vbeing brought adjacent 'to said lower surface 34..Where the lower surface 3001; said pressing plate has been roughened inany of the manners to be explained, said plate 36 is brought intowelding juxtaposition to'the lower surface at of said 'bodyportiqflaz-wltn the roughened Slower surface thereof lowermost. *Fi 9illustrates a suitable welding clamp 93 comprisigge base 84 'having theconvex seat 00 adapted to of the pressing. te' thereon with a suitableinsulating sheet 08 ,of asbestos, or other insulating materialinterposed between them and. having the bolts I00 projecting laterallytherefrom and the adjustment clamping plate I02 havingsuitable boltholes I00 therein and a suitable depres .-sion- I05 for receiving thevalve portion 04 of said pressing head therein; In actual practice twosets of clamping fixtures 83 are employed. one on each side of thecentral valve extension 84" of the body member, the depression I06therefor-being theoretically formed between each of said clampin'gfixtures. The ends of the bolts I00 are nuts-I08 for adjustably clampingthe adjustable clamping plates, I02 towards the clamping fixed plates94. for urgingthe body portion flinto close juxtaposition with thepressing plate 30 lying on its retaining base portion of the areaof'contactbetween the-outer edge of the pressing plate and the outeredge of 'body portion, as the pressing greater area than that of thelower surface I4 of the body portion it will project as shown at I1continuously around the periphery of said con-.

tacting edges. '1 have illustrated a suitable welding tool 0 heated-manysuitable manner to a suitable welding heat brought adjacent theprojecting edge'II along; the upper surface of the pressing'plate asshown in dotted lines therein;

lower surface 34.01 the body portion- 32,.it is obvious that when weldedthereto in use it will tend at all times'to contact the lower ends ofthe bosses ceive. the concave lower surface 88 threaded and are providedwith suitable wing 96,-which extends longitudif nally ofboth fixtures93. As' shown at the lower the marginal portion of the lower surface ofthe plate is of slightly said projecting edge 31 melting without dele-wneath said lower surface 38 and the sand I4u,.

teriously. affecting the lower exposed pressing surface. of saidpressing plate 38 to form the melted weld II2 continuously rigidlyJoining the edges of the pressing plate and of the marginal portion 46on the lower surface 34 of the body portion 32 around the peripheriesthereof. Any method of welding may be employed, gas welding as well aselectrical welding and the tool H8 shown merely diagrammaticallyillustrates any suitable type of electrode which may be employed forelectric welding.

As stated, the lower surface 38 of the pressing plate may besuitably'roughened as at before or after welding in any suitable manneror it may if desired be left smooth.

As stated, various types of screening or cloth attachments have beenprovided in the prior art for superimposing a layer of screening orcloth over the lower pressing surface 38 and one convenient form ofroughening as a substitute for and to-obviate the necessity of such aseparate member comprises the application of wire screening impressions44 on the lower surface 38 of said pressing plate. I have illustrated inFigs.

11-14 a suitable method of making these wire screening impressions onsaid lower surface38. First the pressing plate may be formed of thedesired size and with the desired number of perforations as shown inFig. 11. I then superimpose three layers of material, the top layer- II4 of which may comprise a pressing plate 38, the intermediate layer '6of which may comprise an actual layer of wire screening and the lowerlayer 8 of which may comprise another pressing plate 38 or any othersuitable. shape. The

three superimposed layers are then passed between the adjustably spacedcompressing rollers -I2I and I22 to compress said layers as'shown inFig. 13 and with such compression forcing the individual wires I28 ofsaid wire screening II8 into the adjacent surfaces of said layers 1 I4and H8 to provide the wire screening impressions" I23 or roughenedindentations 44' in each of said layers. The respective'layers H4, H8and H8 may then .be conveniently separated. and the pressing plate 38 soroughened welded to its rebrought under compression by any suitablesource of fluid in said tool I38, is violently urged against the lowersurface 38 of said pressing plate providi ng arough, closelypitted-surface 44 as the roughened surface of said pressing plate. Ihave discovered that it is desirable to keep the lower ends oftheperforations 42 open, but that if desired their efficiency may beincreased by partially constricting them 'as shown ,at I42 in- Fig.

. 21. It is apparent that. with a pressing head.

constructed in the manner hitherto described that itis already providedwith a steam spray discharge chamber 54 discharging directly into saidperforations I I 44 may be inserted inthe connection 64 to the of othertypes of. articles.

steam discharge chamber 54, through which fluid may be passed to bedischarged into said steam spray chamber 54 and outwardly through theperforations 42in said plate 36, while the fluid actuated'sandblast isbeing projected upwardly against the lower. surface 38' of said pressingplate-38. It is obvious thatzthe velocity of said streams, namely, thatof. air discharging downwardly through said perforations and that of thesandblast discharging upwardly against said lower surface 38 may beadjustably. regulated, preferably by simply controlling'the velocity offluid in said inlet pipe I44 so that said upward stream of fluid willdischarge said sand particles I48 against said-surface 38 inamanner'only constrictingthe lower ends 142 of said perforations 42, butnot totally obstructing them while simultaneously pitting and rougheningsaid pressing'surface 38 as at 48''.

While-my improved method-is primarily =designed-for the manufacture ofpressing heads, it is obvious that various inherent steps thereof arenovel and may be individually applied if desired for otherpurposes inthe'.manufacture It isiapparent therefore that I-have provided a noveltype of pressing head with the advantages set forth above.'

ited to the specific embodiments shown or methspective body portion inthe mariner shown in The lower surface 38 of said pressing plate may beroughened by providing it with the corrugations 44" and I haveillustrated in Figs. 15-19 a suitable methodof corrugating it. Fig. 15illustrates a preperforated and preformed pressing plate 36. Fig. 16illustrates a suitable corrugating roller I24 provided with the diagonalcorrugating lines I28 therein suitably mounted on a stub axle I28 onthe-lower end of a holder I30. The pressing plate is then laid.

on a suitable base I32 and the corrugating roller I24 relatively passedover it in any suitable manner,-such as in the longitudinal lines I33shown in Fig. 18 with sufficient downward pressure being exerted on theholder I to provide said lower surface 38withsaid corrugations 44".

, I have shown in Figs. 20 and 21 an'al ternativev method'ofrougheningthe lower surface 38 of the pressing plate comprising sandblasting it.While, if desired, the lower surface of said press ing plate may besuitably sandblasted, or otherwise pitted prior to being welded to thelower surface of' the body portion 32, I have discovered'that' it may besandblasted in a convenient manner after it has beenwelded to said bodyportion. For this purpose, any. type of sand-- blasting tool I38 isbrought into position under-- ods described and that various deviationsthereof may be made therefrom without departing from 60 the spiritandscope of the. appended claims.

What I claim is: 1. Ahollow pressing head" for pressing ma-.

chines comprising, a hollow relatively thick light metal or lightmetalalloy' body of the class consisting of magnesium, aluminum andtheir re-- spective alloys and a relatively thin pressing plate of lightmetal or alloy of-a higher M. P. than the melting point of the metalbody of the class consisting of magnesium, aluminum and their respectivealloys and having a multiplicity of preformed perforations therein, andacontinuous fillet extendingentirely along the edge of the pressingplate and body contaning metal melted from the edge 'of the pressingplate fused thick hollow light and having a multiplicity of preformedperforationsth'erein, and a continuous fillet extending entirely alongthefedge of the pressing plate and body containing metal .melte from theedge 42 and that a suitable pipe.

It is understood that my mveiiuon is not limhollow metal body.

a of the pressing plate fusedto. the edge of said reiatiyely thickhollow metal body.

3. A- hollow pressing head for pressing machines comprising a hollowrelatively thick alu- -minum alloy body and. a relatively thin pressingmetal melted from theedgeof the pressing plate fused to the edge of saidrelatively thick hollow metalbody. 4. A hollow pressing head chinescomprising, a hollow relatively thick alu plate of aluminum or aluminumalloy of a higher M. P. than the M. P. of the aluminum alloy body havinga closely pittedlower surface and having a multiplicity of preformedperforations therein, and a continuous fillet extending" entirely alongthe edge of the pressing plate and body containing metal melted from theedge of the pressing plate fused to the edge of said relatively thickhollow metal body.

5. A hollow pressing head for pressing machines comprising a hollowrelatively thick alu-' minum alloy body anda relatively thin pressingplate of aluminum or aluminum alloy of a higher M. P. than the M. P. ofthe aluminum alloy body having a corrugated lower surface and having amultiplicity of preformed perforations therein, and a continuous filletextending entirely along the edge of the pressing plate and bodycontaining metal melted from the, edge of-the pressing plate fused tothe edge of said relatively thick 6. A hollow pressing head for pressingmachines comprising a hollow relatively thick alufor pressing maof thebody portion andto insure contact of said plate with at least part ofthe lower surface of said body portiom 8, The method of making apressing head which comprises, casting a hollow. light metal alloypr'essing head body portion-,forminga relato the contacting edges ofsaid bodyportion and minum alloy body and a relatively thin pressingwhich comprises, casing a hollow light metal minum alloy body anda-relatively thin pressing plate of aluminum M. P. than the M-. P. ofthe or aluminum alloy of a higher aluminum alloy body.

having a lower surface and having a multiplicity of preformedperforations therein and a con-' tinuous fillet extending entirely alongthe edge of the pressing plate and. body containing metal melted fromtheedge of the pressing plate fused to the edge of said relatively thickhollow metal 1 body, said lower. surface having-wire screen impres'sionsthereon.

7. The method of making a pressing head. which comprises, casting ahollow light metal alloy pressing head body portion having .a trans-'versely arched lower surface, cutting from a relae tively thin sheet oflight metal or alloy of higher tively thin pressing plate of light metalor alloy of higher, M.'P. than the melting point of'the metal body,drilling a multiplicity of holes in said plate, bringing said plate byitself into welding juxtaposition with the lower surface of said bodyportion,'and applyin a welding heat plate to melt the edges of saidplate to weld the edges of said plate to the edges of the lower surfaceof said body portion without substantially melting any of the exposedlower surface of said pressing plate underlying said body portion andany of the meta-lof the body portion. 9. The ,method of making" apressing head,

alloy pressing head body portion having a transversely arched lowersurface, forminga relatively thin pressing plate of light metal or alloyof higher -M. P. than the melting point of the metal body, drilling amultiplicity ofholes in said plate, transversely arching said platewitha smaller radius than that of the low surface of said body portion,bringing said pla e by itself into welding juxtaposition with the-lowersurface of said body portion, and applying a weld.- ing heat to thecontacting edges of said body portion and plate to melt the edges ofsaid plate the lower surface of said body portion without substantiallymelting any of the exposed lower.

surface of said pressing plate underlying said portion and to insurecontact of said plate with at least part of the-lower surface of saidbody portion. T

10. The method of ma ing a pressing head which comprises forming ahollow light metal or light metal alloy pressing head body portion ofsubstantial volume, forming a relatively thin pressing plate ofsubstantially the area of the M.'P.- than the melting point of the metalbody,

a pressing plate of slightly-greater area than the lower surface of saidbody portion, drilling a multiplicity of holes in said plate,transversely arching said plate with a smaller radius than that of thesurface of said body portion, roughening the lower surface of saidplate, bringin said plate by itself into welding juxtaposition with thelower surface of saidbody portion with said roughened surface lowermostand applyin a a welding heat to the contacting. edges of said bodyportion and plate to melt the projectin edges of said plateto weld theedges of said plate.

to the edges of the lower surface of said body portion withoutsubstantially melting anyof the exposed lower surface of said pressingplate underlying said body portion and any of the metal the pressingplate fused to the edge of lower surface-of said body and of a lightmetal or'alloy ofhigher M. P.- than said body, forming 'a'multiplicityof minute. perforations in said plate, bringing said plate by itselfinto weldin juxtaposition and applying a welding heat-to the contactinedges of saidbody and plate to melt the edges. of saidplate to weld theedges of said plate to the edges ofsaid surface of said body withoutsubstantially melting away any of the exposed surface of said relativelythin plate overlyin said surface of said-body and any of themetal of thebody.

11. A hollow chines comprising,'a hollow relatively thick aluminum'alloybody and a relatively thin pressing plate of aluminum or aluminum alloyof a-higher M. P. than with the outer ends of said perforationspartially constricted; and a continuous fillet extending entirely alongthe edge of body containing-metal melted from-the edge of 7 saidrelatively thick hollow metal body.

' FRANK C. LORNI'IZO.

to weld the edges of-said plate to the edges of with the lower surfaceof said body.

pressing head for pressing. ma-

the M. P. of the aluminum alloy body having a closely pitted lowersurface and havins; a' multiplicity of preformed perforations thereinthe pressing plate and

